A predistortion circuit for a microwave amplifier and more particularly to predistortion circuit configured as a Doherty amplifier. In some embodiments, the method includes extracting a shape of the apparatus from a thin sheet of conductive material, and folding the shape into a plurality of resonant circuit elements. The light system includes a switch that controls the power to the light system. The frame has a first portion, a second portion and a bendable connecting portion which is located between the first portion and the second portion. Also provided are compositions containing the compounds and methods of making both the compounds and compositions thereof.